Hi, We are going to be moving our production postgres databases to new SAN with polyserve clustering filesystem. Can anyone running postgres on polyserver tell us what file system mount options should we use to get best performance? Our existing san with ext3 filesystem mounted with " rw,noatime,data=writeback " gives us good performance. In our new san with polyserve we have mounted files with options "psfs rw,dboptimize,shared,data=ordered " and we are getting poor performance as compared to existing san with ext3. For eg: A restore of a 15 G database on our existing san with ext3 take 45 min but the same restore on san with ployserver takes 1 hr 40 mins. I used the wal_sync_method = fdatasync and still the restore time with polyserve was 1 hr 40 mins. Removing the dboptimize option gave little better performance but was still half hour more compared to etx3. So can some one please suggest what mount options should we use to get good performance out of polyserve. Any help will be appreciated. Thanks Paramjeet Bhella
